So allow me to offer an interpretation of events that casts Comey as more of a patriot and hero than an ass-covering weasel. Compare my interpretation with whatever movie you have in your head and see which one works best for explaining and predicting.

It’s all just speculation as of this morning, but there almost certainly is something very big in the new find.

If you want the latest most up-to-date info on this issue, including plenty of speculation, go here.

EDIT 11/01: A strong counterargument to the above is that Comey did a fake investigation in the first place and in so doing has pissed off the majority of FBI people. To correct this and because explosive new evidence has been found, he sent the letter to Congress. Here is a presentation of that argument: